Frequencies for first 10,000 rows of esrd_ntwrk_num variable in pos2010 dataset :

       ESRD |
  NETWORK # |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,158       91.58       91.58
         05 |          1        0.01       91.59
         08 |        135        1.35       92.94
         13 |         95        0.95       93.89
         15 |        146        1.46       95.35
         16 |          9        0.09       95.44
         17 |        156        1.56       97.00
         18 |        300        3.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017